Curing agents for compounds

1. A compound comprising:

A. a fluoroelastomer comprising copolymerized units of:

(1) one or more unsaturated fluorinated olefins;

(2) one or more unsaturated fluorinated olefin co-monomer different from 1) selected from the group consisting of fluorovinyl ethers, unsaturated fluorinated olefins, unsaturated olefins, and mixtures of these; and

(3) one or more cure site monomers selected from the group consisting of nitrile-containing fluorinated olefins and nitrile-containing fluorinated vinyl ethers; and

B. 0.1 to 10 mole percent of at least one curing agent of formula (I):

R 1 N═CR 2 R 3   (I)

wherein:

R 1 is H;

R 2 is selected from the group consisting of, NH 2 , and NR 4 R 5 ;

R 3 is selected from the group consisting of, SO 2 H, NR 6 R 7 , 2-pyridine, and CH 2 CONH 2 ;

R 4 is H;

R 5 is selected from the group consisting of, NH 2 , and CN;

R 6 is selected from the group consisting of H, CCONH 2 , and

R 7 is selected from the group consisting of, COOC(CH 3 ) 3 , NH 2 , CH 2 COOH, CSNH 2 ,

CNHNH 3 + Cl − , p-phenylCN, COPh,

provided that when R 7 is CSNH 2 , R 2 is not NH 2 .

2. The compound of claim 1 , further comprising 0.1 to 5 phr of a curing agent C different from curing agent B.

3. The compound of claim 1 , wherein the unsaturated fluorinated olefin (a)(1) is selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, 1,1-difluoroethylene; 1,1,2-trifluoroethylene; 1-fluoroethylene, and mixtures of these.

4. The compound of claim 2 , wherein the unsaturated fluorinated olefin (a)(1) is selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, 1,1-difluoroethylene; 1,1,2-trifluoroethylene; 1-fluoroethylene, and mixtures of these.

5. The compound of claim 3 , wherein the unsaturated fluorinated olefin co-monomer (a)(2) is selected from the group consisting of perfluoro(methyl vinyl) ether, hexafluoropropylene, perfluoro(propyl vinyl) ether, and mixtures of these.

6. The compound of claim 4 , wherein the unsaturated fluorinated olefin co-monomer (a)(2) is selected from the group consisting of perfluoro(methyl vinyl) ether, hexafluoropropylene, perfluoro(propyl vinyl) ether, and mixtures of these.

7. The compound of claim 1 , wherein the curing agent B is selected from the group consisting of amidinoamidine HCl, phenyloxoaminoamidine, 3-(5-phenyl-4H-1,2,4-triazolyl)amidine, 1H-pyrrolylamidine, benzimidazolylamidine, aminothioxoamidine; aminocarbonylmethylamidine HCl, N-aminoamidine bicarbonate, N″-1H-pyrazolyl-N′-t-butoxycarbonylamidine, 2-pyridylamidine HCl, sulfinoamidine, and mixtures of these.

8. The compound of claim 5 , wherein the curing agent B is selected from the group consisting of amidinoamidine HCl, phenyloxoaminoamidine, 3-(5-phenyl-4H-1,2,4-triazolyl)amidine, 1H-pyrrolylamidine, benzimidazolylamidine, aminothioxoamidine; aminocarbonylmethylamidine HCl, N-aminoamidine bicarbonate, N″-1H-pyrazolyl-N′-t-butoxycarbonylamidine, 2-pyridylamidine HCl, sulfinoamidine, and mixtures of these.

9. The compound of claim 8 , further comprising at least one filler selected from the group comprising nonperfluoro-fluorine-containing elastomers, micropowders, carbon black, stabilizers, plasticizers, lubricants, processing aids, and mixtures of these.

10. The compound of claim 2 , wherein the curing agent C is selected from the group consisting of organotin curing agents, bis(aminophenol) curing agents, bis(aminothiophenol) curing agents, tetraamine curing agents, triamine curing agents, diamine curing agents, and mixtures of these.

11. The compound of claim 2 , wherein the curing agent B is selected from the group consisting of amidinoamidine HCl, phenyloxoaminoamidine, 3-(5-phenyl-4H-1,2,4-triazolyl)amidine, 1H-pyrrolylamidine, benzimidazolylamidine, aminothioxoamidine; aminocarbonylmethylamidine HCl, N-aminoamidine bicarbonate, N″-1H-pyrazolyl-N′-t-butoxycarbonylamidine, 2-pyridylamidine HCl, sulfinoamidine, and mixtures of these.

12. The compound of claim 10 , wherein the curing agent B is selected from the group consisting of amidinoamidine HCl, phenyloxoaminoamidine, 3-(5-phenyl-4H-1,2,4-triazolyl)amidine, 1H-pyrrolylamidine, benzimidazolylamidine, aminothioxoamidine; aminocarbonylmethylamidine HCl, N-aminoamidine bicarbonate, N″-1H-pyrazolyl-N′-t-butoxycarbonylamidine, 2-pyridylamidine HCl, sulfinoamidine, and mixtures of these.

13. The compound of claim 6 , wherein the curing agent B is selected from the group consisting of amidinoamidine HCl, phenyloxoaminoamidine, 3-(5-phenyl-4H-1,2,4-triazolyl)amidine, 1H-pyrrolylamidine, benzimidazolylamidine, aminothioxoamidine; aminocarbonylmethylamidine HCl, N-aminoamidine bicarbonate, N″-1H-pyrazolyl-N′-t-butoxycarbonylamidine, 2-pyridylamidine HCl, sulfinoamidine, and mixtures of these.

14. The compound of claim 13 , further comprising at least one filler selected from the group comprising nonperfluoro-fluorine-containing elastomers, micropowders, carbon black, stabilizers, plasticizers, lubricants, processing aids, and mixtures of these.